Automatic tape transmitter



Aug. 9, 1938.

E. F. KLEINSCHMIDT AUTOMATIC TAPE TRANSMITTER Original Filed. Nov. 1, 1930 3 Sheets-Sheet l O 5 MK INVENTOR 50%4190 ff Kl E/IVJC/lM/OT M I a m NM h E. IF. KLEINSCIHMIDT AUTOMATIC TAPE TRANSMITTER 3 Sheets-Sheet 2 Original Filed Nov. 1, 1930 rem N m wm .9 mg w 0W5 005 090 025 6: nan GEO GI 05 m m0. P: :40 n9 Eau 6. :40 B 23 No E5 M5? wwm W Aug. 9, 1938. E. F. KLEINSCHMIDT AUTOMATIC TAPE TRANSMITTER Original Filed Nov. 1, 1950 3 Sheets-Sheet 5 QR 0Q o o o oo 0 o 0 0 o 00 000 ODOQODOOOQQOOOOOOOO OO.O 0o 00 000 0000 o o o o 00 o QN QLM \m Patented Aug". 9, 1938 UNITED STATES PATENT OFFICE signor to Teletype Corporation, Ghicago, 111., a corporation of Delaware Original application November, 1, 1930, Serial No. 492,855. Patent No. 2,000,083, dated May '7, 1935. Divided and this application April 5, 1934, Serial No. 719,104

19 Claims.

This invention pertains to automatic telegraph systems in which a record is made in directly legible characters by facsimile methods of operation, and relates more specifically to telegraph systems in which each letter or symbol is scanned or analyzed into a succession of constituent elemental areas of positive and negative surfaces.

The present application is a division of application Serial No. 492,855, filed November 1, 1930 by E. F. Kleinschmidt, entitled Facsimile printing telegraph system and apparatus, which matured into Patent No. 2,000,033, granted May '7, 1935.

An object of this invention is to provide apparatus for the transmission of messages in a system in which the messages are reproduced by facsimile printing receivers and in which proper phase relation of receivers with respect to incomingsignals is maintained by start-stop control signals supplied by operation of a controlling transmitter.

A further object is to provide a transmitter for facsimile type transmission, in which prescanning is embodied, and to provide a transmitter which may be. started into operation by a keyboard, by a perforated tape control, orby any of the wellknown methods of control used in automatic printing telegraphs. I

The above and other objects of the invention are accomplished by combining methods which are characteristic fundamentally either of type printing telegraphs or of facsimile telegraphs,'in a manner which will affect transmission of code combinations of signal impulses representing a scanning record of individual characters, by providing a preliminary transmitting record in a code simpler than a scanning record, by providingan automatic transmitter which first translates from the simpler code into the scanning code, and by providing novel mechanism details in the automatic transmitter.

The system of the invention is adapted for transmission of a fixed set of characters such as conventional letters and numbers and a high accuracy of scanning is achieved by providing a system of mechanical prescanning, in which first, the total area of a character with its adjacent margins is analyzed into elementary dark and lightareas traversiblein a sequence, the several elemental areas then being recorded upon a mechanical transmitting member in one form for a dark elemental area and in another form for a light elemental area, the record upon the transmitting member being such in nature that electrical transmission may be effected from it by a transmitting member having a continuous lineal traversing relative motion. Specifically, a transmitting disc may have projections upon its edge in locations to represent dark areas and notches or absence of projections upon its edge in locationsto represent light areas. Such a record member may be revolved with its edge in such relation to an electrical transmitting contact that n the" contact is closed by the projections to transmit positive current impulses representing the dark elemental areas, and is reversed by the absence of a projection to transmit negative current or no-current representing light elemental areas. A complete set of such record members is provided, and one for each of the characters to be transmitted, after which transmission may be effected by selecting one of said members and transmitting a character under its control, then selecting another of said members and transmitting a character under its control.

Automatic mechanism is provided for rapid and consecutive selection and operation of transmitting re cord members under control of individual keys in a keyboard or under control of a record tape of any desired form such as a tape perforated with cornbinational holes in permutation arrangement. For the operation of transmission under control of a perforated tape, feelers are arranged to detect combinational holes in the tape, these feelers are caused to adjust into selective position a set of code bars which control mechanical selection'of a desired transmitting disc identified by a cornbinational arrangement of holes in a controlling tape, and a selected disc member then is caused to transmit the code combination of scanning nature which is recorded upon it. An indefinite length of perforated tape will produce continuous transmission of successive scanning codes of signals, and a novel tape follower mechanism is provided which will interrupt the reading'and feeding of the tape when the controlling tape becomes taut Selection of a transmitting member and transmission therefrom is effected by providing means for rotating all scanning code members continuously, providing a contact brush for each such member, normally holding the brushes out of contact with the character members, then selecting a brush corresponding to a desired character member, and permitting the into operating contact with its transmitting memher. A notch to control transmission of a starting signal ina start-stop system is provided in each character code disc and a disc member similar to a character code disc and with a continuselected brush to move ously operating contact brush is provided for transmitting a stop signal between successive character codes. Further, a full disc member adapted to transmit a continuous stop signal or line holding signal is provided with a brush which may be selected in the manner of selecting a brush for character transmission, with an arrangement in the selective mechanism by which the brush for transmitting a line holding signal is selected automatically by the selecting mechanism when controlled by a taut tape mechanism, the transmitter then operating to stop reading the tape, to stop the transmission of character code conditions, and

to begin transmission in lieu thereof of a continuous line holding signal or stop signal.

A better understanding of the invention may be had from the following description when taken in conjunction with the accompanying drawings, wherein,

Fig. 1 is an elevational and partly sectional view of a transmitter according to this invention;

Fig. 2 is a plan view of a portion of the apparatus shown in Fig. 1;

Fig. 3 is an end View partly in section of the apparatus shown in Fig. 1;

Fig. 4 is a diagram showing relations between cams in detail of timing, and for transmitted signals;

Fig. 5 is a partial 5 5 of Fig. 1;

Fig. 6 shows a. form of perforated control tape which may be used to operate the transmitter;

Fig. 7 shows a transmitting disc adapted for sending character signals;

Fig. 7B shows a transmitting disc for sending plan view taken on line the stop signal between successive charactersignals;

Fig. 7C shows a transmitting disc for sending a holding signal during periods of. suspension of transmission of facsimile signals, and

Fig. 8 shows analysis of a character for scanning, the character there shown corresponding to the disc shown in Fig. 7.

Having reference to Fig. 3, a motor II operates shaft I2 to which is secured spiral gear I3 meshed with spiral gear I4 of non-conductive material on one end of .code disc shaft I5. Code disc shaft I5 is journalled in bearings mounted in suitable standards or brackets I6, mounted on an insulating plate I8 which is fixed upon the base ll of the transmitter. The object of. the plate I8 is to insulate the shaft I5 from the grounded base I! because the shaft I5 is in electrical engagement with the code discs which form a part of the electrical circuit of the transmitter.

Gear I4 in turn meshes with spiral gear I9 carried on cam shaft 2I, journalled in brackets 22, fixed to base I'I. Similarly fixed to shaft 2| near the opposite end thereof is spiral gear 23, Fig. 5, adapted to mesh with spiral gear 24 carried on second code disc shaft 25. Shaft 25 is parallel to shaft I5 and likewise is journalled in brackets 26. Shafts I5 and 25 turn in opposite directions to facilitate mounting and operating transmitting brushes.

Gears I4, I9, 23, and 24 are so related that the speed of the three shafts I5, 2I, 25 is the same. Gears I4 and 24 are insulating in nature to insulate the code disc shafts I5 and 25 from the frame I'I.

Referring to Figs. 1 and 5, operating shaft 2I carries four cams. Cam 2! draws down the feeler slides 28, of which there are six shown, and releases the slides at the proper time in the cycle of operation to permit the slides to rise under control of tape 29 as determined by holes in the tape, the slides 28 being sufiicient in number to detect all code holes in the tape 29. A suitable six-unit perforated tape of wellknown arrangement is shown in Fig. 6.

In the present embodiment, the tape, as shown I in Fig. 6, has transverse rows of holes 3|, each row having six code-hole positions and representing a character or signal. Tape 29 is also provided with a series of feed perforations 3IA which cooperate with the teeth of feed wheel 32, Figs. 1 and 3, for advancing the tape in a stepby-step manner. Tape 29 may be prepared by a keyboard perforator or by a receiving reperforator of any desired or well-known construction.

Cam 2'! is engaged by cam follower roller 30 on arm 33 which is integral with and extends from one leg of U-shaped bail 39. A cone 33' extends between and is fixed to, as by brazing or upsetting, the parallel legs of U-shaped bail 39. The cone 33' is drilled through and is carried pivotally together with the bail 39 and integral arm 33 by the shouldered screw 34 which is fixed rigidly in a boss on the bracket 35. Arm 33 has two off-sets o positely directed, and with bail 39 and cone 33' it forms an integral member having roughly the shape of an arabic numeral 6 as viewed in Fig. 5. Bail 39 normally tends to rotate in a counterclockwise direction (Fig. 1) under the influence of spring 36 attached to cam follower arm 33 and to spring post 38 fixed in bracket 35. Ball 39 has attached across the parallel legs thereof and near the bases of the legs a U-shaped member M which in turn spans and engages all of the lugs 42 of the six feeler levers 28 and of a tape slide 43.

The leg of bail 39 which is connected to cone 33' at the opposite end from arm 33 is provided with a substantially vertical arm 41 (Fig. 1), the end of which is fashioned for engagement with pawl member 48, loosely mounted on shoulder screw 50 in pivot shaft 49 journalled in bracket 35. Fixed to pivot shaft 49 for rotation therewith and associated with pawl 48 is stop arm 5I. Secured to the end of arm 5I is spring post 52 to which is secured one end of spring 53, the other end of which is secured to the end of pawl 48. Thus pawl 48 may be held in operative relation with the arm 41 of lever 33. Engaging faces of members 41 and 48 are beveled to lock against tension of spring 53 except when they are disengaged or unlocked by action of cam follower 30.

Referring to Fig. 5, pivot shaft 49 is operatively held in its bearing in bracket 35 by a collar 54 and set screw 55. Pivot shaft 49 is provided near its end with a hole through which tape stop rod 56 is threaded and secured by means of set screw 51. Rod 56 is provided with lateral arm 58 adapted to engage tape 29, which, as it approaches the sender from the right (Fig. 1), passes under arm 58 of rod 56, thence through tape guide 59 on guide plate 60 on frame 6| fixed to base I'I. Thence tape 29 passes through guide 62 to a receiver for used tape.

Thus oscillation of tape rod 56 and its associated assembly of arm 5I etc., is controlled by the alternate tautness and slackness of tape 29. As tape 29 becomes taut, it rotates the tape rod 56 and its associated parts in counterclockwise direction to the full line position of Fig. 1, and thus positions pawl 48 for engagement with coacting arm '41. The resiliency of the spring-held connection between pawl 48 and arm 5I prevents the tape 29 from being strained in case pawl 48 and arm 41 are not in engaging relation. The tape stop arm assembly normally tends to rotate in a clockwise direction due to the over-balancing effect of the stop arm member 56 on the arm member 5|. While tape 29 is slack, the tape stop assembly will assume the dotted position shown in Fig. 1, holding pawl 48 out of operative relation with arm 41.

Approximately journalled in mounting frame 6| is shaft 64 (Fig. 1) to which are fixed feed ratchet wheel 46 and feed or sprocket wheel 32. The tape guide 59 is slotted to permit the teeth of sprocket 32 to extend through to engage feed holes 3|A (Fig. 6) of tape 29.

Suitably mounted near the top of tape feed lever 43 (Fig. 5) is tape feed pawl 45 (Fig. 1), which coacts with tape feed ratchet 46 to effect rotation thereof in a step-by-step manner, thus imparting similar rotation to shaft 64 and feed or sprocket wheel 32. Pawl 45 is spring-pressed against the ratchet 46 by a suitable spring 66. Appropriately mounted in frame 6| and in 00- operative relation with ratchet 46 is detent member 61 with detent roller 68 and spring 69.

Positioned in slide guides 1| and 12 of mounting frame 6| are feeler slides 28 (of which there are six in the present instance) and tape feed slide 43, said slides being held in the grooves by retaining plates 13 and 14. Each of said slides 28 and 43 is provided with its individual spring 15, each spring extending from a lug 16 on its associated lever to common spring bracket 11 (Fig. 3) fixed to cross tie 18 of mounting frame 6|. Said levers 28 and 43 thus are urged upwardly by their springs 15 unless prevented by yoke member 4| upon follower lever 33.

Each feeler slide 28 is provided with its individual feeler pin 19 in the upper end of each slide and cooperates with code perforations 3| in tape 29, and similar holes in tape retaining member 8| hinged at the side of tape guide 59, as shown in Fig. 3. Member 8| is provided with a suitable latch 82 adapted to hold said member down with block 8| entering between flanges on tape guide 59. Thus, when cam follower roller 39 of follower lever arm 33 is in contact with the low part of cam 21, the follower lever arm assumes its counterclockwise position due 'to the action of spring 36, and accordingly member 4| assumes its uppermost position. The feeler slides 28 then are free to move upwardly due to the tension of their individual springs 15. However, only those slides 28 will move whose individual feeler pins 19 have found a code perforation 3| in the tape 29.

Simultaneously tape feed slide 43 carrying tape feed pawl 45 is also permitted to assume its uppermost position such that pawl 45 is permitted to engage the next tooth of ratchet 46 preparatory to effecting the rotation of ratchet 46 one step, which rotation will be effected by the downward movement of tape feed slide 43, when follower lever arm 33 again moves clockwise which occurs when the follower roller 39 again is engaged by the high part of the cam 21.

Each feeler slide 28 is also provided with its stop lug 83 adapted to cooperate with a testing finger 84 on the end of transfer levers 85 which are equal in number to the tape feeler slides 28 to which they correspond severally. The six transfer levers 85 are pivotally mounted independently upon common pivot shaft 86 suitably held in a pair of brackets 81 integral with mounting frame 6|.

Each transfer lever is provided with a lug 88 to which is secured one end of an individual spring 89, the other end being connected to an adjusting screw 9|. Transfer levers 85 thus normally tend to rotate in a clockwise sense due to the action of their individual springs 89. Each transfer feeler 85 is also provided with a reset lug 93 and power lug 94.

Reset lugs 93 (six in number in the present instance) are spanned by reset bail arm of the transfer feeler reset bail lever 98, pivotally mounted at 91 on bracket 35, and carrying cam follower roller 99 adapted to engage the periphery of reset cam I9| due to spring I92, secured to bail arm 95 and to spring post I93 fixed to bracket 35. Cam |9| is fixed upon shaft 2|.

, Cam follower roller 99 normally engages the high part of cam I9I, thus maintaining reset bail 95 in its extreme clockwise position, as shown in Fig. 1, against the action of spring I92. Bail arm '95 by its cooperation with reset lugs 93 thus normally holds transfer levers 85 in their counterclockwise position against the action of individual springs 89 and away from lugs 83, to permit the free operation of the feeler slides 29. Therefore, when cam follower roller 99 engages the low part of reset cam |9I, reset lever 98 will rotate in a counterclockwise sense under the action of spring I92, thus rotating bail arm 95 out of operative engagement with reset lugs 93 of transfer levers 85, which then are free to rotate in a clockwise sense due to the action of their individual springs 89 unless prevented by associated stop lugs 83 of feeler slides 28. That is, if a feeler slide 28 has been permitted to rise due to finding a perforation in the tape, its stop lug 83 will have been raised out of the path of testing finger 84 of transfer lever 85. Conversely, if a feeler slide 28 fails torise, associated testing finger 84 will engage the interposed stop lug 83 and prevent its transfer lever 85 from rotating. When reset lever 98 resumes its clockwise position, bail arm 95 will again engage reset lugs 93 and restore transfer levers 85 to their normal counterclockwise position.

Each transfer lever 85 is also provided with its individual power lug 94 adapted to cooperate with the end of a permutation bar I94, the number of which is equal to the number of transfer feeler levers 85; namely, six in this instance.

Permutation bars I94 comprise flat strips set of each bar is provided with a series of notches arranged according to the permutations of the signal code. The notches in permutation bars" I94 are so arranged that for every combinational setting of the bars, only one complete alignment of notches is effected. Each permutation bar I94 is adapted to assume two positions. Its normal position is to the right (Fig. 1), to which position each bar is urged against its associated power lug 94 by tension of its individual spring I91. Its operated position is to the left by a determined distance, to which position it is urged by its associated power lug 94, propelled by spring 89. Springs 89 and I91 have strength such that spring I91 may move bar I94 to the right, and such that spring 89 may produce upon bar I94 a power double that of spring I91, being thus able to overcome spring I91 and move bar I94 to the left.

Each permutation bar I94 is provided near its right end with two V-shaped notches I I2, adapted to cooperate with permutation bar looking or detent lever H3 pivotally mounted at H4 on bracket 35. Lever H3, urged by spring H5, constantly tends to rotate in a clockwise sense into operative relation with the notches in permutation bars I04. The other end of lever I I3 is provided with earn follower roller IIG engaging the periphery of permutation bar detent cam II1. Cam H1 forces lever I I3 in a counterclockwise direction against the action of spring H5 so as to disengage from notches H2 for a brief interval to permit permutation bars I 04 to be reset in accordance with a new combination.

Associated with permutation bars I04 are eligible units I3I (Figs. 1 and 3) one such unit being provided for each character to be transmitted and hence one for each setting of the notches of the permutation bars. Referring to Fig. 3, the units I3I are pivotally mounted on a pair of pivot shafts I22 and are alternately arranged on either side of permutation bars I04. Said pivot shafts I22 are mounted in suitable brackets I23 fixed to base I1. Each unit I 3I comprises a bell crank lever, the substantially horizontal arm I25 of which is provided at its end with a stem portion I26 carrying a series of small rollers I21 which cooperate with the permutation bars I04. Stern portions I26 of units I3I are guided for vertical motion in slots of the pair of comb bars I28 secured to the sides of permutation bar guide I06. Attached to the free end of each stem I26 are springs I29, the other ends of which are attached to the bottom of comb bar I28. Thus springs I29 tend to draw arms I25 of units I 3| against the six permutation bars I04.

Each unit I3I carries at its upper end the insulation I32 and screw I33 which clamp brush I34. Brush I34 cooperates with code discs I35 carried by shafts I5 and 25. Discs'l35 are mounted tight upon their respective shafts I5 and 25 and are spaced by conducting collars I36 which connect all discs electrically to the feed disc I4I at the end of each shaft I5 and 25. Discs I31 of insulating material are also placed between code discs I35 to prevent brushes I34 from dropping deeply into the notches of the discs I35. All discs are positioned by rod I38 in proper angular relation and clamped together so that all discs I35 may rotate as a unit.

Each such code disc has associated with it an individual brush I34 with its operating eligible member I3I. All brushes I34 are connected to a common wire I39 (Fig. 2) and all code discs I35 are connected through shafts I5 and 25 and through the end disc I4I (Fig. l) to the common wire I42 (Fig. 2), the brush for disc I4I always engaging with unnotched surface of the disc. The wires I39 and I42 form the output circuit of the transmitter. Each code disc I35 has a high radius I43 at each point where a signal is to be transmitted, thereby connecting the wires I38 and I42 at such times.

When the series of notches in permutation bars I04 pertaining to an eligible unit I3I are aligned, the selected unit I3I will be rotated slightly as the stem portion I26 with its associated rollers is drawn into the aligned notches by its individual spring I29. Thus brush I34 individual to the selected unit I3I will be rotated into engagement with its associated code disc I35. All code discs I35 are constantly rotating and the selection of a unit I3I and the contact of its associated brush I34 and code disc I35 are properly timed so that said contact will always occur at the proper point on the periphery of the code disc, as described hereinafter.

Located below the stem portions I26 of the units I3I and guided in the permutation bar guide I06, is bail blade I45 (Figs. 1 and 3) which is elevated to raise the selected unit I3I out of the aligned notches and further to lift all units free from the bars I04 preparatory to the shifting of the permutation bars I04 in accordance with a new combination. Pivotally connected to downward lugs I46 on bail blade I45 are a pair of bell crank levers I41 pivotally mounted in base I1. The other arms of bell crank levers I41 are pivotally connected to connecting link I43, one end of said link I48 being extended to pivotally connect with arm I49 of bail operating lever I5I. Bail operating lever I5I is pivotally connected to permutation bar guide I06. Carried on lever I5I is cam follower roller I52 engaging bail operating cam I53 on shaft 2I. Bail blade I45 normally assumes its downward position as shown in Figs. 1 and 3 due to the tension of spring I54, attached to one of the bell crank levers I41 and to base I1.

Referring to Figs. 7 and 8, code discs I35 are designed according to a method of prescanning. The character to be transmitted is divided into any desired number of transmitting units of area. The several units of each character thus created are assigned in sequence to the edge of the disc I35 individual to that character, in the order of scanning, and the dark units are made of high radius to engage the brush I34 to send a signal.

This method of and apparatus for prescanning each character and providing an electrical transmitting element in accordance therewith is described and claimed in Patent No. 2,000,083, granted May '7, 1935.

For an example of prescanning, the letter R is shown in Fig. 8 together with the blank area between the letter and the preceding letter. It is preferred to leave a blank interval also below the letter so that when the letters are printed in rows one above the other, there will be a space or a white line between the rows. This total area is divided into 450 units of area, 25 high and 18 wide. Its corresponding code disc is shown in Fig. 7.

Scanning begins at the unit I55 (white) and progresses vertically to the unit I56, continuing immediately at unit I51, again at unit I50, and again from unit I59 to I6I, completing the scanning of 78 successive white units, resulting in the low radius arc I62 on the disc I35 of Fig. 7. The scanning of black units extends from unit I63 to unit I64, resulting in the high radius arc I65. Then the three white units I66 to I61 result in the low arc I68 and the 22 black units I69 to I1I result in the high arc I12. Continuing in like manner, scanning of the total area of Fig. 8 results in the total arcs on the edge of disc I35 of Fig. '7.

Code disc I35 represents the letter R. Other code discs shown in Fig. 2 represent other characters. Every character code disc has the initial starting arc I62 of Fig. 7, and all starting arcs I62 are arranged in alignment.

In Fig. 7C is shown a code disc I8I having a continuous high edge. This is the disc for the line-holding signal or idle-line signal. The brush I 34 is shown movable for selection.

In Fig. 7B is shown a code disc I83 having a high edge, of 50 degrees of angle. This is the disc for the stop signal. The brush I84 for the disc I83 solely is shown fixed and not movable for selection.

H in d sc i d in d ta th cons u ti n of th ansm tt pp ra s. a esc ipt on of th n al op ra ion f th t nsmi te wil be i en.-

The transmitting apparatus is started in opera.- tion by closing the ,circuitto the motor II; thus causing the shafts I5, 2 I, and 25 120 be rotated at the same speed, The speed of the motor Il may be governed as shown in Patent No. 2,000,083 of record above. 1

Perforated tape 29 is properly engaged'with the feed wheel .32 whereby the tape will advance in step-by-step manner toward the left of the apparatus as viewed in Fig. 1.

Transmission of signals isv controlled by the slackness or tautness of the tape, whereby operation of the transmitter is suspended when the feed .of the tape is stopped or slowed down, and the Slack is taken up by continued operation of the transmitter. For example, if a keyboard perforator is being used to perforate directly the tape, there will be slack in the tape and the lever 58 will assume the dotted line position (Fig. 1) before transmission will start. If the perforator is operated faster than the transmitter operates, the locp in the tape, or the slack, will increase .and the transmitter will continue to operate. If the tape is perforated slower than the transmitter operates, or if perforation'stops, the slack in the tape will be gradually taken up by the transmitter until the tape becomes taut. This tautness of the tape will move the bar 58 to the full line position shown in Fig. 2, thus moving the lever 5I downwardly and carrying the latch 48 into the path of movement of arm 41 on lever 33.

Therefore, .upon the next counterclockwise movement of lever arm 33 under action of its spring 36 after the tape tightens, when the roller 38 thereof leaves the high portion of its cam 21, arm 41 carried by bail 39 will be latched by the latch 48 and transmission of signals will be suspended, since U-shaped member 4| carried by bail 89 cannot rise to release feeler slides 2.8. With the parts in this position, the motor and the driven cam shaft 2I continue to rotate but the feeler slides 28 are not allowed to rise and therefore there is no new selection of a character.

Whenever receiving apparatus operates on the start-stop principle, it is necessary that the transmitter be arranged to transmit start-stop signals to operate receivers properly. Therefore,..the transmitter is arranged. to operate the start-stop receivers by the following mechanism.

In Fig. 70, the code disc I8I effects an idlesignal condition at the receiver. Its brush I34 is selected and is operated against the disc I8I whenever all permutation slides I 84 are at the right in Fig. 2, a selection which is produced either by detaining the arm 41 by the latch 48, thus holding down all of the slides 28 by the bail 4|, or by a non-perforated tape which likewise will hold down all of the slides 28 and estop the action of all transfer levers 85.

In Fig. 7B, the code disc I83 sends the periodic.

stop and start signals. Its brush I84 is not subject to selection and the disc I83 makes engagement with the brush I84 at every revolution.

-When disc I8I is selected, there will be no start signal, since discs IBI and I83 effect continuous contact between wires I42 and I38 of Fig. 2. Should disc I35 be selected repeatedly, the 60 degrees low arc of disc I35 will be occupied by disc I83 which will send a marking signal of 50 degrees for stop and then a spacing signal of 10 degrees for start. The angles may be varied as desired in any specific embodiment of this invention, 7 V

Assume that tape 29 is engaged with feed wheel 32, that the tape is taut to engage latch 48 with arm 41, holding the bail 4| down and the follower 38 up, that motor II is running and is driving cams 21, II, I11, I53, and also driving all of the code discs. Disc I8I is selected by the position of slides 28. Brush I34 engages disc I8I through 310 degrees or more and brush I84 enages disc I83 through 50 degrees and a continuous marking signal is transmitted. The mechanical actions are the repeated engagement of cam 2! with cam roller 30 once each revolution of shaft 2|, each such engagement acting to lift arm 4'! briefly from latch 48, and the repeated lifting of the brush I34 from disc I8I by cam I53 and hail blade I45. This would interrupt the transmitter current but the break is closed by disc I83 and fixed brush I84.

The middle point of the period of engagement of cam 21 and roller 30 will be taken arbitrarily as the Zero angle from which a cyclic study of operation will be made. The shaft 2I and earns in Fig. 1 are shown about 50 degrees before this zero angle occurs. The timing chartyof Fig. 4 shows two cycles of lapsed time. The line I85 indicates the electrical signal as transmitted to the line circuits over wires I39 and I42.

roller 30 act to rotate lever arm 33 clockwise,

thus preventing the skipping of a combination in the tape 29.

The passing of the apex of cam 2'! permits slides 28 to rise when holes are found in tape 28.

Cam IIII then permits transfer arms 85 to rotate where feelers have risen. Lugs 94 push against permutation bars I04 which are held locked by bail H3. Cam I83 then operates bail I45 to lift all members I25 and cam II'I operates bail II3 to unlock permutation bars I04 briefly, permitting transfer levers 85 to operate permutation bars I04 corresponding to holes found in tape 29. Cam I53 permits bail I45 to descend to effect selection of a code disc; cam I8I permits ball 95 'to descend to restore the transfer members; cam .27 forces bail 4I down to restore the feelers and to step the tape 29. The bail I45 lifts all brush levers I3I from the discs during the time that transfer levers. 85 are against the bars I84.

The line signal during the third cycle of Fig. 4 is holding signal (marking) by disc IBI to angle degrees, then stop signal (marking) by disc I83 to angle 205 degrees, at which point a spacing signal is sent for'10 degrees to start the remote receiver. The character code is sent from angle 215 degrees to angle 155 degrees of the next cycle, when the stop signal by disc I83 begins again.

In two successive codes where a bar I84 is set to the left by spring 89 for the first code and is required to be reset to the right for the second, the feeler slide 28 will not rise on. the second code, the transfer lever 85 Will'not rotateion the second code, and when the locking edge i I3 is lifted by cam III and follower roller IIB, the bar I84 will be drawn to the right by power of'the spring I01, the bar I04 being stopped in correct position by engagement with its controlling lug 94.

As explained in connection with Figs. 7 and 8 there is provided an initial blank or non-contacting segment on each disc corresponding to blank spaces of Fig. 8 from point I55 to I59, or referring to Fig. 7, corresponding to the non-contacting segment I62. As the discs I revolve, signals are transmitted over the outgoing lines in accordance with a scanning of the selected character. However, due to the novel arrangement of providing an electrical contacting segment whose contact portions and non-contact portions correspond to the dark and light areas of the character, actual transmission of signals may take place at a much higher speed than any true scanning operation could transmit corresponding impulses, and therefore transmission of the characters is much more rapid than could be obtained by a scanning operation.

Another important feature of this invention which contributes to the high speed of operation thereof is the overlap whereby transmission of a selected character may be carried on during the period that a subsequent character is being selected and the mechanical parts corresponding to the subsequent character are being positioned to select said character. This is true because the selected unit maintains its contact brush I34 in contacting position during one revolution of the shaft 2|, during which the parts are being positioned for the next character.

As previously described, if the tape 29 has become taut due to transmission having been suspended, the latch 48 will engage arm 41 of bail 39 and retain the feeler slides 28 in their downward position.

This returns the mechanism to the initial position, and the parts pass through the same cycle as above described, to thus successively select holding disc IBI by engaging its individual brush I34 therewith, as long as no tape 29 is fed to the transmitter.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

What is claimed is:

1. In a telegraph transmitter, a plurality of transmitting members each having elements for transmission of signals for one character, means for selecting said members by control of perforations in a tape, a cyclic cam shaft, and means for controlling the operation of said transmitter by tension of said tape jointly with said cam shaft.

2. In a telegraph transmitter, a plurality of transmitting members each having elements for transmission of signals for one character, a cyclic cam shaft, and means controlled by cam followers and operable once in each cycle of said shaft for selecting one of said transmitting members and for transmitting therefrom.

3. In a telegraph transmitter, a plurality of tape controlled feeler fingers, a plurality of code signal transmitting elements each adapted to transmit a code signal of one character, means for periodically controlling the selection of a transmitting element by said feeler fingers, a

further transmitting element, and means con trolled by the tension of said tape for controlling the selection of said further transmitting element.

4. In a telegraph transmitter, a plurality of transmitting elements arranged in two symmetrical sets, a plurality of permutation bars, a plurality of detector levers controlled by said permutation bars and adapted to control said transmitting elements, and a resetting bail for said detector bars and positioned between said permutation bars.

5. In a telegraph transmitter, a plurality of permutation bars, a plurality of transmitting elements arranged symmetrically on both sides of said permutation bars, and a plurality of detector levers adapted to be controlled by said permutation bars and to control said transmitting elements, alternate ones of said detector levers being pivoted on opposite sides of said permutation bars.

In a telegraph transmitter, code transmittime members variantly adapted each to transmit a complete code signal, means for selecting said members, a recurrently operating transmitting member and means for operating one of said code transmitting members between successive operations of said code members.

7. In a telegraph transmitter, a plurality of transmitting members each adapted to transmit a complete code signal, selectively adjustable contactors for said members, a further transmitting member and a fixed contactor for said further transmitting member, and means for operating said fixed contactor alternately with selected ones of said adjustable contactors.

8. In a telegraph transmitter, a first transmitting element, a plurality of eligible code transmitting elements shaped to represent a code signal, a further eligible element shaped to represent a holding stop signal means for selecting one only from all of said eligible elements and means for operating selective ones of said eligible elements consecutively with respect to each other and alternatively with respect to said first element.

9. In a telegraph transmitter, a record tape controlled selecting mechanism, tape tension responsive means for controlling said selecting means, a first transmitting element shaped to transmit a single signal impulse, a plurality of eligible transmitting elements shaped to transmit a code signal, a further transmitting element, means under control of a record tape for selecting one of said eligible elements, and means under control of said tape tension responsive means for selecting said further transmitting element.

10. In a telegraph transmitter having a cylic operation comprising three successive time periods, a transmitting element shaped to transmit invariably a signal during the first period of every cycle, a plurality of selectable transmitting elements shaped to transmit a code signal during .the third period of any cycle, a selectable transmitting element shaped to transmit a continuous signal, means to operate said first mentioned element repeatedly, means to select and operate ones of said selectable elements and to transmit from said selected elements in alternation with transmission from said first mentioned element, and further means to select said last mentioned transmitting element and to transmit therefrom continuously.

11. In a telegraph transmitter having a cyclic operation comprising three successive time periods, a tape controlled selecting mechanism, tape tension responsive means for controlling said selecting means, a transmitting element, a plurality of selectable transmitting elements, means to operate said first mentioned element invariably, means under control of a record tape for operating certain of said selectable elements, and means under control of said tape tension responsive means 'for operating a particular one of said selectable elements.

12. In a telegraph transmitter, a tape controlled selecting mechanism, a tape tension responsive mechanism, a contact operable independently of said selecting mechanism for transmitting a recurrent signal, a contact operable 'selectably, and means controlled by said tape tension responsive mechanism to operate said selectable contact to transmit a continuous signal.

13. In a telegraph transmitter, a plurality of elements each individually for sending a complete code signal, a further element for sending an idle-line signal, means for selecting one of said elements in response to records in a tape, and means for controlling the selection of said further element in response to the tension of said tape.

14. In a telegraph transmitter, a plurality of transmitting elements for transmitting code signals, a further transmitting element for transmitting an idle-line signal, feeler pins for detecting perforated codes in a tape, means for selecting ones of said transmitting elements and for transmitting code signals consecutively in response to perforated codes in said tape, and means to select said further element when said pins detect no code in said tape,

15. In a telegraph transmitter, a plurality of transmitting elements each individually for transmitting a complete character code signal, a further transmitting element for transmitting an idle-line signal, feeler pins for detecting perforated codes in a tape, means to select one of said transmitting elements in response to said feeler pins and for transmitting code signals from selected ones of said elements, and further means to select said further transmitting element in response to the tension of said tape and to transmit an idle line signal therefrom.

16. In a telegraph transmitter, a code transmitting mechanism, a locking latch for disabling said code transmitting mechanism, a cyclic cam, a cam follower to unlock said latch at every cycle of said cam, and means for unlatching said transmitting mechanism and operable during the period that said latch is unlocked by said cam.

1'7. In a telegraph transmitter, a cam, a tape controlled mechanism, and a latch to disable said mechanism conditioned directly by the tension of the tape and rendered effectual by said cam.

18. In a telegraph transmitter, a tape controlled mechanism, a bail to disable said mecha-- nism, a cam controlling the position of said bail, and a tape controlled arm efiective on said bail jointly with said cam.

19. In a telegraph transmitter, a tape controlled mechanism including a plurality of sensing fingers, a bail operative on said fingers, a cam controlling the position of said ball, and a tape controlled arm effective on said bail jointly with said cam for controlling the operation of said fingers.

EDWARD F. KLEINSCHMIDT.

CERTIFICATE OF CORRECTION. Patent No. 2,126,597. August 9 1958., I

EDWARD F. KLEINSCHIIIDT.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 5, first column, line 8, for the word "Approximately" read Appropriately; page 6, first column, line 75, claim 5, for "of" read for; and that the'said Letters Patent shouldbe read with this correction therein that the same'may conform to the record of the case in the Patent Office.

Signed and sealed. this lhth day of February, A.D. 1959.

Henry Van Arsdale.

( Acting Commissioner of Patents. 

